Car dumping apparatus



Och-4, 1932. RE. WHITTEKER CAR DUMPING APPARATUS Filed Sept. 27, 1929 3 Sheets-Sheet 1 I II I ATTORN EY INVENTOR Oct 4, 1932.

R. E. WH'ITTEKER CAR DUMPING APPARATUS Filed Sept. 27. 1929 3 Sheets-Sheet 2 INVENTOR ATTORNEY Oct. 4, 1932. R. E. WHITTEKER, 1,331,155

CAR DUMPJ-ING APPARATUS Q Z 2 S; g "Awcm iqav Patented Oct. 4, 1932 PATET ROBERT E. WI-IITTEKER, F CHARLESTON, WEST VIRGINIA, ASSIG'NOR TO KAN'AWHA MANUFACTURING COMPANY, OF CHARLESTON, VJEST VIRGINIA, A CORPORATION or wns'r VIRGINIA CAR DUMPING APPARATUS 7 Application filed September 27, 1929. Serial No. 395,683.

This invention relates to apparatus for dumping cars and more particularly to apparatus by which the car is partially rotated to dump the car contents and then returned to its normal upright position, and it is an object of this invention to provide an apparatus of the type described in which the contents of the cars may be dumped atsuch a distance from the service track serving the apparatus that the service track will not be obstructed by the dumped material. It is also an object of this invention to provide an apparatus of the type described having a frame which receives the cars and which may be moved so as to dump the car at a distance from the service track and return the car to its starting position. A further object is to provide an apparatus of thetype described the operation of which may be controlled from one place by a single operator; and a still further object of this invention is to provide an apparatus of the type described which may be readily installed and moved when necessary and which will be of simple construction and reliable in operation. A still further object of the. present invention is the provision of an apparatus for dumping cars which includes a supporting frame having a rocker frame mounted thereon for rocking movement, and av shiftable carriage mounted on the supporting frame and adapted to be actuated or moved along the supporting frame to urge the rocker frame to rocked position when actuated in one direction, and to remain in contact with the rocker frame as the latter returns to normal position whereby to retard the descent of the rocker frame as it a sumes its normal position.

With these and other objects in view, as will appear more fully hereinafter, the invention consists substantially in the construction, combination, location and relative arrangement of the parts, all as will be'more fully herein set forth, as shown in the accompanying drawings and finally pointed out in the appended claims;

In the drawings:

Figure 1 is a top plan View of acardump ing apparatus constructed in accordance with this invention, parts belng broken away to show other parts more clearly and a car being indicated in position in dotted outline;

Fig. 2 is a side elevation of the car dumping apparatus shown in Fig. 1, a car being shown inplace ready for dumping, and some parts being broken away to show other parts more clearly; I

Fig. 3 is a View similar to F ig.'2 with the apparatus shown in the extreme dumping position';

Fig. 4: is a partial vertical transverse section taken as 011 line H of Fig. 2;

Fig. 5 is a partial vertical longitudinal section of the rocker frame taken as on line 5-5 of Fig. 1;

Fig. 6.is a transverse section of one of the side members of the rocker frame taken on line 66 of Fig. 2; and

. Fig. 7 is a fragmentary view, partly in sec tion, showing certain details of construction including a portion of one of the side members of the supporting frame and the rocker frame associated therewith, together with the roller for supporting and actuating the rocker frame.

As shown in the drawings, a car dumping mechanism constructed in accordance with this invention comprises a main supporting frame 1, a rocker frame 2 and a power carriage 3. The main supporting frame comprises spaced parallel channel members 6 placed with their webs vertical and their flanges projecting outwardly. The channels 6 are joined at one end by a channel 8 and at intervals throughout their lengths their bottom flanges are connected by pairs of angles 10 placed back to back. The channels 6 are also connected by diagonal braces 12 attached to the channels 6 by gusset-s 14 adjacent the connections of the angles 10 to the channels. Both the angles 10 and braces 12 extend beneath the bottom flanges of the channels 6. For a portion of their length adjacent one end, the channels 6 have angles 16 attached to the inner surfaces of their webs, the angles 16 being arranged with one flange vertical and attached to the web and the other flange horizontal and projecting inwardly. Fora portion of their length the horizontal inwardly projecting flanges of the angles 16 are prothroughout their length the strips 18 and the horizontal flanges of the angle 16 are notched as at 20. The angles 16 define spaced tracks for supporting the rocker frame and may be termed rocker frame tracks.

The rocker frame 2 Comprises, in th main, spaced parallel members 22 formed as webs or plates indicated at 24 which are thickened alon one. edge as shownvat 28. The spaced mem ers 22 are supported on the rocker frame tracks 16, heretofore mentioned, more particularly .on the wear strips 18 asshown clearly in: Fig. 4 and the thickened edges '28 are provided at intervals for a portion of their length with lugs 26 (see Fig. 6) which projectinwardly from said thickened edges. The members 22' are preferably of. the form shown clearly in Figs. 2 and 3 and each-thereof comprises a base portion 30 and rear and front ends 32 and 34 respectively. The ends 32 and 34 are designated as rear and front ends merely for convenience, as will be obvious. The rocker frame 2 normally is arranged in the position shown in Fig. 2 and the base 30 rests upon and is supported by the before mentioned rocker tracks 16. The rear ends of themembers 22 are gradually upwardly curved or offset as clearlyshown in Fig. 2, and the extreme rear ends are arranged at an elevation slightly above the tops of the channel members 6, for a purposehereinafter to be described. The front ends 0f the members 22 are sharplyupwardly curved to define rocker elements 34 and at intervals throughout the length of the rocker elements .34 there are provided adjacent the junction of the webs 24 and the lugs 26 a plurality of teeth 36'adapted to enter the before mentioned notches 2O when'the frame 2 is rocked.

As shown clearly in Fig. 5, spaced bars or channels 38 extend between and connect the .base portions 30 of the side members 22. V The channels 38 support a plate 40 which extends between the side members 22 and projects heyond the channels 38. At the edges of the 1 to the side members 22, and connecting the angles 44 are angles 48 and 50,theangles 48 and 50 being placed with a horizontal flangepr j ecting inwardly. To the channel 43 and side members 22-are attached vertical angles 52 which are connectedby angle 54 and a. plate 56. To the plate 56 there is attached a horizontally extending angle 58, the angles 58 and 54 being arranged with a horizontal flange projecting inwardly and disposed opposite the angles 50 and 48, respectively.

.The 'plate 56 extends upwardly to the ends of the rocker elements 34 and is provided with hoods 60 which receive the ends of the rocker elements34. acent the'upper ends of the angles 52 the plate 56 is'attached to a channel 62 which is connected to the rocker elements 34. The plate 56 extends beyond the rocker elements 34 of the side members 22 andwhen the rocker frame is in tilted position, as shown in Fig.3, the plate 56 extends beyond. the channels 6' of the main supportin frame, and the ends of the'channels 6 are received in the hoods 60; the plate 56thus forming a discharge chute or apron for the dumped material. To the plate 40 are. attached angles or rails 64, upon which travel the wheels of the cars to be dumped. Extending through the channels 38 and 42 isash aft 66 journaledin bear ingscarried by the channels and having fixed thereon] stops 68 which are mounted on the shaft 66 between the pairs of channels .38'and project through openings in the plate 40-adj acent the rails 64. Steps 68 are provided with crank arms 69 connected by links 70 and springs 72 to cross piece 74, the arrangement beingsuch that the springs 72 are'normally car from the rocker frame; After the passage of bothp-airs of the wheels of the car over the first stops '68,. these steps will be raised by the springs 72 in back of the rear pair of wheels on the car and the car will then be held between the pairs of stops '68.

The shafts 66 project beyond the channel 42 and. at their ends are provided withlevers 7 6 by means of which the stops may be 0perated to permit a car to pass from the rocker frame or to pass over the rocker frame, if such action is desired.

To operate the rocker-frame 2 there is provided a carriage 3, which carriage comprises a rectangular frame composed of longitudinally and transversely arrangedchannels78 and 80, respectively, whlch are suspended from bearings 82 and 84, the bearings 82 having stub-axles 86 journaled thereimwhile the bearings 84 havethe axle:88 j ournaled there in. Upon the endsoftheaxles 86 and 88 are mounted wheels 90 which travel upon the upper'flanges of the channels 60f the main supporting frame 1. The members 7 8 and 80 support a plate 92 upon which is mounted a motor .94 connected through a flexible coupling 96 anda ,reducnig gear 98 to drivea shaft 100. The shaft 100 is journaled in bearings 102 attached to thejcham nels 78 and at its ends has fixed thereon sprockets 104. Sprockets .104 engagewith, drive chains 106 which are connected atone supporting frame l by yielding connections 108 and have their other ends connected to lugs 110 on the rocker. elements 34 of the side members 22 of the rocker frame 2; .Between their ends the drive chains 106 extend along the curved portions 34 of the side members 22 of the rocker frame lying in channels 112 attached to the lugs 26 on the side mem bers and extendsover idler sprockets 114 and 116 carried on shafts 118 and 120, respectively, journaled onthe carriage 3. The arrangement, of, theidler sprocketsis such that the chains 106 are always held in engage- .ment with the sprockets 104 in all positions of the carriage 3. V V V The control of the motor 94 is by a su table controller which will cause the motor to operate in either direction or to stop. A controller of this type is indicated at 122, but

' as'it forms no part of this'invention it is not illustrated in detail. Power for the operation of the motoris received through the line wires 124 and is led to the controller 122 and through limit switches 126 and 128 arranged on the main supporting frame 1 and operated by the wheels 90 at the extreme limits of movement of the carriage 3. The current willpass to the motor through the flexible leds' 130 supported in any suitable way, as by the upright 132 upon which the controller 122 is mounted and the swinging arm 134. Before passing to the motor, however, the current will be passed through a solenoid brake138of the usual type in which application of current to the motor will cause the brake to be released and cutting off the current from the motor, will permit a spring to apply the brake. Asthis brake is of a common construction and forms no part of this F inventioin'it is not illustrated in .detail,.but

its application inthis construction will permit of the operator stopping the motor at any time, whereupon the brake will hold the carriage 3 in the position to which it has been moved.

As shown in Figs. 2 and 3, the main frame 1 when in service is placed transversely of the rails 140 upon which the carsare brought to the apparatus with the frame extending over the side to which it' is desired to dump the cars. he frame 1 will in this case be supported upon the rails 140 and upon timbers 142 placed outside of the rails 140. Where it is possible and desired, timbers 144 secured to the channels 6 by angles 146 may be used to support the outeriend of the frame 1. Where the frame is placed so that it is raised above the rails 140, ramp rails 148 connected to the main supporting frame 1 will be usedto raise the car to the level of the rails 64 of the rocker frame 2'. p 7 r Arranged on axle 88 adjacent wheels 90 andfreely rotatable on the axle are bearing wheels 152, and when the rocker frame is in:

normal position the carriage 3 is in a position such that the offset ends 32 of the rocker frame members 22 rest upon the bearing 'wheels- 152 in a manner clearly illustrated in Fig. 2 and also in the fragmentaryuview,

Fig. 7. i

n operation, the car will be moved along the track 140 and ramp rails 148 onto the rails 64 of the rocker frame, the wheels depressing the first stops 68 and the front wheels engaging the farther stops 68, whereupon the first stops 68 will be raised in back of the rear wheels of the car and the stops 68 will hold thecar in position on the rocker frame 2. In this position the angles 50 and 58 will come above the top of the sides of the car and closely adjacent thereto, while the angles 48 and 54 will engage in the brackets 150 attached to the under side of the carfloor; these angles serving to retain the car on the rocker frame when the frame and car are tilted. While angles engaging both above and below the car sides are shown, it will be understood that the angles above. or below may be used alone. With the car in position, the operator will cause the motor 94 to be operated, operating the gear 98, shaft 100 and the sprockets 104. The sprockets 104 through their engagement with the chains 106 will cause the carriage 3 to shift on the supporting frame, and the respect to the main frame 1. Movement of the rocker frame and car towards the position shown in Fig. 3 will cause the contents of the car. to be dumped;-the contents passing along the plate 56 and to one side of the main frame 1. WVhere the contents of the car dump freely, the operator may stop the motor by the operation of the controller before the rocker frame reaches the extreme position shown in Fig. 3; but in case the operator does not, the engagement of the wheel 90 with the limit switch 126 will cutoff the current from the motor 94 and apply the brake 138, stopping further movement of the rocker frame and car. With the car in the position shown in Fig. 3, or in any dumping position, operation of the motor 94 to move the carriage in the opposite direction will cause the carriage 3 to travel to the right in Fig. 3 thereby retracting the supportingwheels 152 from position below and in contact with the thickened portion 28 to 32 of rocker frame 2 and permitting the rocker frame 2 and car to return to normal position, as shown in Fig. 2. In this operation, if the operator fails to stop the motor 94, the wheel 90 at the other end of the carriage 3 will operate the limit switch 128 and cause the stoppage of the carriage V With the-rocker frame; and car returned to normal position,'the"operator moves the lever 7 6 controlling one pairof the stops 68, V permitting the carto be moved-'- from the rockerframe2.- 7 As stated herein, the power carr1ag'e3 is under the control ofan 'operator'during shift ing movements thereof and the movement of the:carri agecan of -cou'rse be regulated; In

vie W'of-V-this it will be apparent thatas the rockervframe assumes its normal position the carriage 3 and particularly the Wheels 152 serve tov'retardthe descent of said frame thus preventingsud'dendropping of the frame to its normal position andeliminating excessive described, as it .is' obvious that various modi ,fications thereoflwithinthescope of the appended claims Will appear to: persons skilled intheartp.

i What is claimedis': 7 a p 1. In a car: dumping apparatus, a sup- I porting frame,wa rocker frame for receiving a car; carried by said supporting frame and having'side members curved at one end thereof, and horizontally shiftablemeans for engaging .thezside 7 members to rockthe rocker frame:on said supporting frames I 2. In a car dumping apparatus, a frame supported on a suitable base, a rocker frame for receiving a car carried by saidframe and having side members curved at one end thereof, and a carriage traveling on said frame and engaging saidrocker fram'eto rock said rocker frame on the curved ends .of its-side members on said frame.

, '3. In a car dumping apparatus, a frame supported on a suitable base, arocker frame for rece ving a car'carrled by sa1d first-named frame, and a carriage traveling on said firstnamed frame and engaging said rocker frame to'rock the latter on said first-named frameif- V -v .4. In a car-dumping apparatus, a sup portingsframe, a rocker frame for receiving a .car carried by said supporting frame, sprocketchains connected to said supporting and rocker framespa traveling carriage on said supporting frame, and power operated sprockets on said carriageengaging said chains, said-carriage engaging said'rooker frame to tilt said rocker frame upon opera tionofsaidsprockets. n 5. Ina car dumping apparatus, asupport- 'ing frame-,a rocker frame for receiving a car carried by said supporting frame, means connected 5 to "said supporting and rocker frames,-acarr1age operatively engaging said rocker frame and mounted to travel on said support ng-frame rock said rocker frame,

and power operated means on said'carriage and engaging said first mentioned means to shiftsaid carriage when operated. I

6.. In a-car dumping apparatus, a supporting frame, a rocker frame for receiving a car carried by said supporting frame, said rocker frame being curved at one' end, flexible means engaging the curved portion of said rocker frame and having their opposite ends attached to said supporting frame, a carriage operatively engaging saidrocker frame and mounted to travel onsaid supporting frame and rock said rocker frame on the curved portion thereof, and power operated means engaging said flexible means to shift said carriage. v

7. In a car dumping apparatus, a'frame mounted on asuitable support, a rocker frame for receivinga car carried by said first-named frame and havingside members each including substantially straight supporting portions having one end of each thereof upwardly curved, and a rocker frame tilting mechanism shiftable on the firstnamed frame beneath'an d in contact With the rocker frame to cause the latter to tilt on the curved ends on said first-named frame.

8.: In a car dumping apparatus, in combination Withfa supporting" frame and' a rocker frame mountedthereon, car supports arranged transverse to the longer'axis of the rockerframe', and means for rocking said rocker frame comprising a carriage shiftable horizontally on the supportingfframe beneath and in contactwith the rocker-frame I to rock the lattervvhen shifted in one direction and to retard the return of the rocker frame site direction. 7

9. In a car dumplng apparatus, in comto normal position when shifted in the oppo bination with a supporting frame and a rocker frame mounted thereon, means on the rocker frame for supporting a car transverse toithe longitudinal aXis ofthe rocker frame, and rocker frame tilting mechanism mounted on the s'upportingframe and shiftable' horizontally on the latterbeneath and in contact With the rocker frame to tilt said rocker frame. V

10. In a car, dumping apparatus, in combinationf with a supporting frame and a rocker frame mounted thereon, a carriage mounted on the supporting frame and shifta'ble horizontally in two directions beneath and in contact With the rocker frame to'tilt the latter'and toretard the return of the rocker frame to normal position respectively, and means operated by said'carriage near the end of itsshifting movement for stopping said carriage. I s V In a ear dumping apparatus, in combination with a-supporting frame and a rocker frame mounted "thereon for,- tilting movement, supporting tracks arranged trans- V verse to-the longer axis of said rocker frame for receiving a car to be dumped, a power frame to tilt the latter.

12. In a'car dumping apparatus, in combination with a supporting frame and a rocker frame mounted thereon, means for rocking said rocker frame comprising a carriage mounted on the supporting frame, a flexible element connecting said rocker frame and supporting frame, and actuating mechanism on the carriage connected to said flexible element to shift the carriage on the supporting frame beneath and in contact with the rocker frame whereby the carriage urges the rocker frame to'tilted position.

13. In a car dumping apparatus, in combination with a supporting frame and a rocker frame mounted for tilting movement thereon, an electrically actuated traveling carriage on the supporting frame for engaging the rocker frame to tilt the latter, and switch mechanism for engagement by the carriage near the end of its movement for cutting Ofl the actuating power for the carriage to automatically control the movement of the latter.

14. In a car dumping apparatus, in com bination with a supporting frame and a rocker frame mounted for tilting movement thereon, car supports arranged transverse to the longitudinal axis of said rocker frame, an electrically actuated traveling carriage'on the supporting frame for engaging the rocker frame to tilt the latter and to retard the return of the rocker frame to normal position, and means operated by said carriage near the end of its movement in both directions to shut off the power supply for the carriage.

15. In a car dumping apparatus, in combination with a supporting frame and a rockerframe mounted for tilting movement thereon, car supporting means arranged transverse to the longer axis of said rocker frame, and a carriage shiftable horizontally on the supporting frame for engaging the rocker frame to tilt the latter and to retard the return of the rocker'frame tonormal position, said rocker frame being supported by said carriage when it is in normal pos1- tion. 16.In a car dumpingapparatus, space track members defining a supporting frame, track elements secured to said track members, a rocker frame mounted on'the track elements comprising spaced connected members the rear ends of which are upwardly offset and the front ends of which are upwardly curved to define rockers, a shiftable carriage'mounted on the track members, rollers on the carriage engaging the under surfaces of the offset rear ends of said rocker frame members when said rocker frame is in normal position, and means for shifting the carriage on the track members to cause the carriage totilt the rocker frame.

17 In a car (lumping apparatus, a supporting frame, a rocker frame mounted on the supporting frame and comprising spaced side members arranged in parallelism from end to end and each including a substantially straight base portion and upwardly curved forward ends defining rocker elements and upwardly offset rear end portions, a shiftable carriage on the supporting frame, bearing elements on the carriage with which the offset rear ends of said spaced members contact and by which the rocker frame is retained in nor mal position, and means for shifting the carriage to cause the bearing elements to ride along the under surfaces of the spaced members for tilting the rocker frame.

18. In a car dumping apparatus, a supporting frame including spaced track members, an electrically actuated carriage mounted for shifting movement on the track members, a rocker frame on the supporting frame maintained in normal position by said carriage, means for shifting the carriage on the supporting frame to cause it to rock said rocker frame when shifted in one direction and to cause it to retard descent of the rocker frame when shifted in the opposite direction, and switch mechanism operated by said carriage near the end of the movement thereof in both directions for limiting the movement of said carriage.

19. In a car dumping apparatus a supporting frame mounted on a suitable base and comprising a pair of spaced side members, means extending between said pair of side members for connecting the latter and for maintaining them in parallelism, track rails secured to the contiguous surfaces of said members, a rocker frame arranged between said pair of side members and supported by and tiltable on said track rails, means on the rocker frame for supporting a car to be dumped with its longitudinal axis transverse to the longer axis of said rocker frame, and a shiftable carriage mounted on the side members and adapted to engage the rocker frame to tilt the latter.

20. In a car dumping apparatus, a supporting frame comprising spacedmembers each having a track rail secured thereto, a rocker frame tiltably mounted on the track rails beporting frame comprising? spaced members having supporting trackrails, a rocker frame mounted for tilting movement betweensald spaced memberson said rails, means for sup-- porting and locking acar transversely on the rocker frame, and rocker frame actuating means shiftable on the spaced membes to engage said rocker frame to tilt the latter where.

by to efiect side dumping of the car.

22. Means for effecting. side dumping of ra lway cars comprising a supporting frame having spaced members and trackrails car-' I "ried thereby, a rocker frame mounted on said rails for tilting movement betweenthe spaced members,ithe latter serving as guides, track members arranged transverse'to the longitudinal axis of the rocker frame for supportthe car on said rocker frame and power actuated means movable on said spaced-memingframe, a rocker frame mounted on the supporting frame for tilting movement, means forsupporting and looking a car on the rocker frame transverse to thelon-gitudinalaXis of said rocker frame, poweractuated I means reciprocableon the supporting frame for tilting the rockerlframe to effect side dumping of the car, and automatically actuated means operable upon engagement of the power actuated means therewith near the I iend of its movement for limiting the movement of said power actuatedmeans in both *directions. Y j

24c. In a car dumping apparatus, a base frame 'mounted on a suitable support, a

-: i rocker frame mounted on the base frame and adapted to receive a car to be dumped, and a horizontally shiftable carriage mounted on the-base frame, sald frame bearing the entire weight of said carriage and the carriage be- 1 "ing adapted to cooperate with the rocker frameduring movement thereof to tilt'said rocker frame on the base frame.

, 25. In a car dumping apparatus,a supporting frame, a rocker frame carried by the sup- 'I porting frame and adapted to support a car.

to be dumped, a horizontally shift-able carriage mounted on the supporting frame, said frame bearing the entire weight of said carriage and the carriage being adapted to be shifted into engagement. with the rocker f frame totilt the latter on the supporting frame, and power actuated means carried by V I .the carriage'for'causing shifting movement .of the latter. I 26. In a car dumping apparatus, in combination' with a supporting frame and a rocker frame mounted thereon, means for t1lt1ng the rocker. frame COIDPIlSlIlg'YLCZLT- riage mounted on thesupporting frame, a

- flexlble elementyconnecting said rocker frame mg a cartobe dumped, means for locking and supporting frame, and actuating mecha porting frame into cooperating-relation with the rocker frame whereby thesaid carriage urges said rocker frame to tilted position. 27. In a car dumping apparatus, a supporting member, a rockerframe mounted on the supporting member and adapted to receive a car to be dumped, and horizontally shiftable means also mounted on the supporting member and arranged adjacent the rocker frame and adapted to cooperate with said frameduring its shifting movement to tilt the latter. 1 T

28. In a; car dumpingapparatus, a supporting frame, a rocker frame for receiving a car carried by said'supporting frame and comprising side members arranged in'parallelism and curved at one end thereof and horizontally shiftable means for engaging the sidev members to rock the rocker frame on the supporting frame.

' 29. In a cardumpingapparatus, a supporting frame, arocker frame forreceijving a car carried bysaid-supporting frame and having spaced parallel members forming a part thereof, andrshiftable means supported on the'supporting frame-and adapted to cooperate directly with each of the parallel members for. tilting the'rocker frame during shifting movement of said shiftable means.

30. In a car dumping apparatus, a-supporting frame, a rocker frame .for receiving a car carriedbysaid supporting frame and having spacedf'side members arranged in parallelism from end to end and each including substantially ,straightsupporting portions having one end of each thereof upwardly curved, and a rocker frame tilting mechanism supported directly by and shiftable on the supporting framev beneathand in contact with the rocker frame to cause the latter to tilt on 'the'curved ends on said supporting frame. I I

31. In a car dumping apparatus, a sup porting frame comprising longitudinally arranged spaced side members each having a track rail secured thereto, a rocker frame tiltedly mounted on the track rails between said side members, means on said rocker frame for supporting a car torbe-dumped with its longitudinal axistransverse to the longer axis ofthe rocker frame, and a reciprocable carriage mounted on the side members, the latter bearing the entire weight of said carriage and said c'arriagebeing adapted/to engage the rocker frame during shifting movement to'tiltsaid rocker frame. I

32,. In a car dumping apparatus, a base frame mounted on. a suitable support, a rocker frame supported by said base frame for'tilting movementparallel to the longitudinal axis of the base frame, car supporting means arranged transverse to the longer ax s of the rocker frame, and a carriage supported by and shiftable horizontally on the base frame for engaging the rocker frame to tilt the latter and to retard the return of the rocker frame to normal position.

In Witness whereof I have hereunto set my hand.

ROBERT E. WHITTEKER. 

